The single crystal of M‐4‐B was obtained by attaching the boron of BH3 to the amine linker between a tetraphenylethylene (TPE) unit and rhodamine B. M‐4‐B showed a novel sequential tricolor switching from dark blue to bluish‐green and to a reddish color upon grinding. The boron atom played a key role in developing the single crystal.
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Ma et al. (2015) studied this question.
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